Multistage turbine.



T. THOMSEN. MULTIS'I'AGE TURBINE APPLIOATIOH FILED NOV.17, 1910.

1,090,], 10, Patented Mar. 10, 1914.

l7 8 I6 I I5 14 q u) Ck V 8 g Y 7 I A i I WITNESSES. fm/ENTSH a Z & 735 201703 THUMSEN, j; ZZZ. 22 MM HES AT TDHNELY'.

UNITED STATES rAtrEn'r OFFICE.

THE-ODOR THOMSEN, OF CHARLOTTENBURG, GERMANY, ASSIGNOB TO GENERAL! ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

MiJL'rIsrAon TURBINE.

Spciflcatipn of Letters Patent.

. Patented Mar. 10,1914.

To all whom it may concern Be it known that I, 'Tnnonon THOMSEN, a subject of the King of Denmark, residing at Charlottenburg, Germany, have invented certain new and useful Improvements in Multistage Turbines, of which the following is a specification.

This invention relates to devices for regulating the operation of multi-stage elastic fluid turbines, and its object is to provide an automatic valve responsive to the exhaust pressure which will .cut out one or more lower stages when the machine changes over from running condensing to non-condensing. It is generallytcustomary to cut out these stages by hand, in order to maintain a normal speed of rotation. My invention relieves the engineer from this duty, and not only performs the operation of cutting out the stages iinder the conditions stated, but also automatically restores them to service when the machine changes back to 'condensng again. The accompanying drawing is a longitudinal section of a multi-stage turbine equipped with .my invention.

A two-stage turbine isillustrated, but the invention is applicable tqmachines having any number of stages. The casing 1 is divided into two'chambei's Q'and 3 by the diaphragnri 4. In one chamber is a bucket wheel 5 and in the father a {Wheel 6, each provided with-buckets 7 cooperating with stationary intermediates 8. A pipe 9". convevshigh pressure steam to one or more nozzles 10 d1- recting the steam upon the bucketsof the Wheel 5. After acting upon said buckets the steam flows through a nozzle or nozzles 11 in "the diaphragm 4 cooperating wlth the buckets ml the wheel 6. Passing from thiswheel the steam flows away to the exhaust conduit 12 which can beconnected' at will either to the cbndenser (not shown)- or to'a discharge port-13 leading directly to the atmosphere.

A port -14 opens from the chamber 2 into a bypass 1 5 leading directly to the exhaust conduit 12 and cutting out the chamber 3.

This port is controlled by a valve, preferably a piston or puppet valve 16. opening outwardly and suitably connected, preferably'by the stein 17, to a piston 18 working in a cylinder 19 having a closed outer end, and communicating at its inner end with the bypass 15. A-pipe 20 provided with a stop valve 21, conveys steam from a boiler 6t other source at some suitable cottstant'prespiston is greater than that to running non-condensing, the pressure in the bypass 15 uses to atmospheric or thereabout, so that the pressure on the upper balanced, at least to an extent sufiicient to to pass directly from the chamber 2 to the exhaust, cutting out the wheel 6 and causing the turbine to maintain'its normal rate of speed. Whenever the vuse of the condenser sages 12 and 15 will enable the relatively increased pressure on the top of thepiston 18 to close the valve 16 and cause the wheel 6 to come into service again.

This inventionhas the advantage of dispensing with alls prings and other accestions in temperature and also exert a variableload on the value, so that the operation of my. device is reliablt and constant.

In accordance with the provisions of the patent statutes, I have described the. principle of operation ofmy invention together with the apparatus which I now consider to I desire to have it understood that the-apparatus shown is only'illustuative, and that the invention can be carried out by other means. 1 What I claim as new and desire to secure by Letters Patent ofthe United States is:-

1. In'a multi-stage turbine. havinga steam inletland an exhaust. meansgfor automat-i cally cutting out a lower stage when {the turoine'changes fronicondensingto nonrondensing operation., comprising a valve, and a motor for operating the valve which is actuated in one direction by a substantially constant fluid pressure and in the opposite direction by the.;exhaust"pressure of said stage.

sure to the cylinder 19 above the 18.

16 closed. It now, the 'inachinechanges over side of the piston 18 is more nearly counterenable the pressure 1n the chamber, 2 to lift the valve 16. This permits the steam is resumed, the drop in pressure in the passeries which are liable to alter with varia represent. the best embodiment thereof: but 7 turbine havin In a multistage turbine, a bypass around a lowerstage to the exhaust, avalve controlling said bypass, and means for automatically opening said valve when the machine changes from condensing to non-condensing operation, and for closing it'when the machine resumes condensing operation,

' said means including a movable member exposed on one side to the exhaust pressure and on the other side to a constant pressure, and devices connecting the member and the valve. 1

3.111 a multistage turbine, the combination witha puppet valve controlling aportleading from a higher stage to the. exhaust. of a piston of larger area than saidwalve exposed on one side to the exhaust pressure and on the other to a constant higher pressure,- and connections between said piston and said valve.

4. The combination with a multi-st-age in 'a higher stage a port opening into a bypass leading to the exhaust, of a valve in said bypass closing said port from the outside and exposed .to the pressure in said by-pass, a piston of larger area than said vali'e, exposed on one side to the pressure in said bypass, means for conveying steam at a substantially constant pressure to the other side of said piston, and connections between said piston and said valve.

5. The combination in a multi-stage turbine having a bypass leading from a higher stage to the exhaust and a port between said stage and the bypass, of a valve controlling the flow through the portthatis exposed on one side to stage pressure and on the other side to the pressure in the bypass, a stem for the valve, and means connected to the stem that is subjected on one side to the pressure in the bypass and on the other side to a constant pressure.

6. A multi-stage turbine having a bypass leading from a higher stage to the exhaust, a valve controlling the bypass, and means connected to said valve and responsive to changes iii the pressure in the region of the bypass between the valve "and the exhaust for opening and closing the valve.

In Witness whereof, I have hereunto set my hand this 26 day of October 1910.

THEODOB THOMSEN.

\Vitnesses Osna'a DAHLKE, :hRTHUR Opnnsrnanx, 

